package com.nowcoder.community.entity;

/**
 * @Author: shuhuang
 * @description: 封装分页参数实体类
 * @Date: 2022/10/4 21:40
 * @Version java version 1.8
 */
public class Page {
    private int current = 1;
    private int limit = 10;
    private int rows;
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        this.current = current;
    }

    public int getLimit() {
        return limit;
    }

    /**
     * 控制去数据库查询的数量
     *
     * @param limit
     */
    public void setLimit(int limit) {
        if (limit >= 0 && limit <= 100) {
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     *
     * @return
     */
    public int getOffset() {
        return (current - 1) * limit;
    }

    /**
     * 获取总页数
     */
    public int getTotal() {
        if (rows % limit == 0) {
            return rows / limit;
        } else {
            return (rows / limit) + 1;
        }
    }

    /**
     * 获取起始页码
     */
    public int getForm() {
        int form = current - 2;
        return form < 1 ? 1 : form;
    }

    /**
     * 获取结束页码
     */
    public int getTo() {
        int to = current + 2;
        int total = getTotal();
        return to > total ? total : to;
    }
}
